Preparation of self-healing Cf/SiBCN(O) composite using a novel polyborosilazane

Wu, Xishi; Chen, Tongzhou; Wang, Bijie; Song, Yujie; Huang, Qing; Huang, Zhengren

doi:10.1016/j.ceramint.2022.07.100

Cited by 1 publication

(2 citation statements)

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“…Recently, PDC technology has been widely documented due to its simple pyrolysis process and low reaction temperature, which can be used to synthesize highly cross‐linked aerogel and mesoporous ceramics 13,33 . As a ceramic precursor, polysilazane can be used to prepare ceramic products using the PDC method, which has some advantages including low reaction temperature, simple cracking process, and various performances 34–38 . However, how to avoid phase separation between polysilazane and support materials, achieve effective dispersion and prepare a highly cross‐linked polymer framework remains a challenge 27,39 .…”

Section: Introductionmentioning

confidence: 99%

“…13,33 As a ceramic precursor, polysilazane can be used to prepare ceramic products using the PDC method, which has some advantages including low reaction temperature, simple cracking process, and various performances. [34][35][36][37][38] However, how to avoid phase separation between polysilazane and support materials, achieve effective dispersion and prepare a highly cross-linked polymer framework remains a challenge. 27,39 As a traditional processing polymer, phenolic resin is an example of an early-developed carbon aerogel, which provides an idea for solving this problem.…”

Section: Introductionmentioning

confidence: 99%

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Polysilazane hybrid phenolic resin ceramic aerogels with excellent electromagnetic wave absorption performance

Wang,

Zhu

et al. 2023

J Am Ceram Soc.

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Although various aerogels with electromagnetic wave (EMW) absorbing properties have been extensively explored, the development of aerogels with excellent wave absorption performance, low density, and great heat resistance has still met profound challenges. Herein, polysilazane hybrid phenolic resin aerogels (PRVS aerogels) were prepared using the vinyl addition reaction of polysilazane and cross‐linking reaction between polysilazane and phenolic resin. A SiOCN ceramic aerogel with multistage pore structure was prepared via a simple and quick freeze‐drying method and polymer‐derived ceramic (PDC) methods. The SiOCN ceramic aerogels exhibited low density (0.15–0.27 g/cm3), good heat‐shielding (thermal conductivity in the range of 0.03–0.04 W/(m·K)), and excellent wave absorption performance (i.e., RL was about –31.6 dB@16.48 GHz and EAB was 3.85 GHz when the thickness of the ceramic aerogel was 1.2 mm). Hence, the ceramic aerogel absorbing materials could meet the requirements of “wide absorption bandwidth, strong reflection loss, lightweight and thi thickness”. Moreover, the mechanism of low weight, heat insulation, and wave absorption properties of the aerogels were also investigated. We believe this work is of great significance in ceramic aerogels prepared by traditional polymers, which may provide new opportunities for new ceramic aerogels with applications ranging from EMW absorption to aerospace and information technology.

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Section: Introductionmentioning

confidence: 99%